3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Sean Eric Fagan of Cygnus Support.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * @(#)sysconf.c 8.2 (Berkeley) 3/20/94
33 * $FreeBSD: src/lib/libc/gen/sysconf.c,v 1.26 2008/02/27 05:56:57 wollman Exp $
34 * $DragonFly: src/lib/libc/gen/sysconf.c,v 1.5 2008/02/21 12:47:54 hasso Exp $
37 #include <sys/param.h>
39 #include <sys/sysctl.h>
40 #include <sys/resource.h>
41 #include <sys/socket.h>
46 #include <pthread.h> /* we just need the limits */
50 #include "../stdlib/atexit.h"
51 #include "../stdtime/tzfile.h"
53 #define _PATH_ZONEINFO TZDIR /* from tzfile.h */
57 * get configurable system variables.
60 * POSIX 1003.1 (ISO/IEC 9945-1, 4.8.1.3) states that the variable values
61 * not change during the lifetime of the calling process. This would seem
62 * to require that any change to system limits kill all running processes.
63 * A workaround might be to cache the values when they are first retrieved
64 * and then simply return the cached value on subsequent calls. This is
65 * less useful than returning up-to-date values, however.
72 int mib[2], sverrno, value;
73 long lvalue, defaultresult;
84 if (getrlimit(RLIMIT_NPROC, &rl) != 0)
86 if (rl.rlim_cur == RLIM_INFINITY)
88 if (rl.rlim_cur > LONG_MAX) {
92 return ((long)rl.rlim_cur);
97 mib[1] = KERN_NGROUPS;
100 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
102 if (rl.rlim_cur == RLIM_INFINITY)
104 if (rl.rlim_cur > LONG_MAX) {
108 return ((long)rl.rlim_cur);
110 if (getrlimit(RLIMIT_NOFILE, &rl) != 0)
112 if (rl.rlim_cur == RLIM_INFINITY)
114 if (rl.rlim_cur > LONG_MAX) {
119 * struct __sFILE currently has a limitation that
120 * file descriptors must fit in a signed short.
121 * This doesn't precisely capture the letter of POSIX
122 * but approximates the spirit.
124 if (rl.rlim_cur > SHRT_MAX)
127 return ((long)rl.rlim_cur);
128 case _SC_JOB_CONTROL:
129 return (_POSIX_JOB_CONTROL);
131 /* XXX - must be 1 */
133 mib[1] = KERN_SAVED_IDS;
137 mib[1] = KERN_POSIX1;
139 case _SC_BC_BASE_MAX:
140 return (BC_BASE_MAX);
143 case _SC_BC_SCALE_MAX:
144 return (BC_SCALE_MAX);
145 case _SC_BC_STRING_MAX:
146 return (BC_STRING_MAX);
147 case _SC_COLL_WEIGHTS_MAX:
148 return (COLL_WEIGHTS_MAX);
149 case _SC_EXPR_NEST_MAX:
150 return (EXPR_NEST_MAX);
157 * This is something of a lie, but it would be silly at
158 * this point to try to deduce this from the contents
161 return (_POSIX2_VERSION);
163 return (_POSIX2_C_BIND);
165 return (_POSIX2_C_DEV);
166 case _SC_2_CHAR_TERM:
167 return (_POSIX2_CHAR_TERM);
169 return (_POSIX2_FORT_DEV);
171 return (_POSIX2_FORT_RUN);
172 case _SC_2_LOCALEDEF:
173 return (_POSIX2_LOCALEDEF);
175 return (_POSIX2_SW_DEV);
177 return (_POSIX2_UPE);
179 path = _PATH_ZONEINFO;
183 lvalue = pathconf(path, _PC_NAME_MAX);
184 if (lvalue == -1 && errno != 0)
189 case _SC_ASYNCHRONOUS_IO:
190 #if _POSIX_ASYNCHRONOUS_IO == 0
191 mib[0] = CTL_P1003_1B;
192 mib[1] = CTL_P1003_1B_ASYNCHRONOUS_IO;
195 return (_POSIX_ASYNCHRONOUS_IO);
197 case _SC_MAPPED_FILES:
198 return (_POSIX_MAPPED_FILES);
200 return (_POSIX_MEMLOCK);
201 case _SC_MEMLOCK_RANGE:
202 return (_POSIX_MEMLOCK_RANGE);
203 case _SC_MEMORY_PROTECTION:
204 return (_POSIX_MEMORY_PROTECTION);
205 case _SC_MESSAGE_PASSING:
206 #if _POSIX_MESSAGE_PASSING == 0
207 mib[0] = CTL_P1003_1B;
208 mib[1] = CTL_P1003_1B_MESSAGE_PASSING;
211 return (_POSIX_MESSAGE_PASSING);
213 case _SC_PRIORITIZED_IO:
214 #if _POSIX_PRIORITIZED_IO == 0
215 mib[0] = CTL_P1003_1B;
216 mib[1] = CTL_P1003_1B_PRIORITIZED_IO;
219 return (_POSIX_PRIORITIZED_IO);
221 case _SC_PRIORITY_SCHEDULING:
222 #if _POSIX_PRIORITY_SCHEDULING == 0
223 mib[0] = CTL_P1003_1B;
224 mib[1] = CTL_P1003_1B_PRIORITY_SCHEDULING;
227 return (_POSIX_PRIORITY_SCHEDULING);
229 case _SC_REALTIME_SIGNALS:
230 #if _POSIX_REALTIME_SIGNALS == 0
231 mib[0] = CTL_P1003_1B;
232 mib[1] = CTL_P1003_1B_REALTIME_SIGNALS;
235 return (_POSIX_REALTIME_SIGNALS);
238 #if _POSIX_SEMAPHORES == 0
239 mib[0] = CTL_P1003_1B;
240 mib[1] = CTL_P1003_1B_SEMAPHORES;
243 return (_POSIX_SEMAPHORES);
246 return (_POSIX_FSYNC);
248 case _SC_SHARED_MEMORY_OBJECTS:
249 return (_POSIX_SHARED_MEMORY_OBJECTS);
250 case _SC_SYNCHRONIZED_IO:
251 #if _POSIX_SYNCHRONIZED_IO == 0
252 mib[0] = CTL_P1003_1B;
253 mib[1] = CTL_P1003_1B_SYNCHRONIZED_IO;
256 return (_POSIX_SYNCHRONIZED_IO);
259 #if _POSIX_TIMERS == 0
260 mib[0] = CTL_P1003_1B;
261 mib[1] = CTL_P1003_1B_TIMERS;
264 return (_POSIX_TIMERS);
266 case _SC_AIO_LISTIO_MAX:
267 mib[0] = CTL_P1003_1B;
268 mib[1] = CTL_P1003_1B_AIO_LISTIO_MAX;
271 mib[0] = CTL_P1003_1B;
272 mib[1] = CTL_P1003_1B_AIO_MAX;
274 case _SC_AIO_PRIO_DELTA_MAX:
275 mib[0] = CTL_P1003_1B;
276 mib[1] = CTL_P1003_1B_AIO_PRIO_DELTA_MAX;
278 case _SC_DELAYTIMER_MAX:
279 mib[0] = CTL_P1003_1B;
280 mib[1] = CTL_P1003_1B_DELAYTIMER_MAX;
282 case _SC_MQ_OPEN_MAX:
283 mib[0] = CTL_P1003_1B;
284 mib[1] = CTL_P1003_1B_MQ_OPEN_MAX;
287 defaultresult = getpagesize();
288 mib[0] = CTL_P1003_1B;
289 mib[1] = CTL_P1003_1B_PAGESIZE;
292 mib[0] = CTL_P1003_1B;
293 mib[1] = CTL_P1003_1B_RTSIG_MAX;
295 case _SC_SEM_NSEMS_MAX:
296 mib[0] = CTL_P1003_1B;
297 mib[1] = CTL_P1003_1B_SEM_NSEMS_MAX;
299 case _SC_SEM_VALUE_MAX:
300 mib[0] = CTL_P1003_1B;
301 mib[1] = CTL_P1003_1B_SEM_VALUE_MAX;
303 case _SC_SIGQUEUE_MAX:
304 mib[0] = CTL_P1003_1B;
305 mib[1] = CTL_P1003_1B_SIGQUEUE_MAX;
308 mib[0] = CTL_P1003_1B;
309 mib[1] = CTL_P1003_1B_TIMER_MAX;
312 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
315 return (defaultresult);
316 return ((long)value);
319 case _SC_2_PBS_ACCOUNTING:
320 case _SC_2_PBS_CHECKPOINT:
321 case _SC_2_PBS_LOCATE:
322 case _SC_2_PBS_MESSAGE:
323 case _SC_2_PBS_TRACK:
325 #error "don't know how to determine _SC_2_PBS"
327 * This probably requires digging through the filesystem
328 * to see if the appropriate package has been installed.
329 * Since we don't currently support this option at all,
330 * it's not worth the effort to write the code now.
331 * Figuring out which of the sub-options are supported
332 * would be even more difficult, so it's probably easier
333 * to always say ``no''.
336 return (_POSIX2_PBS);
338 case _SC_ADVISORY_INFO:
339 #if _POSIX_ADVISORY_INFO == 0
340 #error "_POSIX_ADVISORY_INFO"
342 return (_POSIX_ADVISORY_INFO);
346 #if _POSIX_BARRIERS == 0
347 #error "_POSIX_BARRIERS"
349 return (_POSIX_BARRIERS);
352 case _SC_CLOCK_SELECTION:
353 #if _POSIX_CLOCK_SELECTION == 0
354 #error "_POSIX_CLOCK_SELECTION"
356 return (_POSIX_CLOCK_SELECTION);
359 #if _POSIX_CPUTIME == 0
360 #error "_POSIX_CPUTIME"
362 return (_POSIX_CPUTIME);
365 case _SC_FILE_LOCKING:
367 * XXX - The standard doesn't tell us how to define
368 * _POSIX_FILE_LOCKING, so we can't answer this one.
371 #if _POSIX_THREAD_SAFE_FUNCTIONS > -1
372 case _SC_GETGR_R_SIZE_MAX:
373 case _SC_GETPW_R_SIZE_MAX:
374 #error "somebody needs to implement this"
376 case _SC_HOST_NAME_MAX:
377 return (MAXHOSTNAMELEN - 1); /* does not include \0 */
378 case _SC_LOGIN_NAME_MAX:
380 case _SC_MONOTONIC_CLOCK:
381 #if _POSIX_MONOTONIC_CLOCK == 0
382 #error "_POSIX_MONOTONIC_CLOCK"
384 return (_POSIX_MONOTONIC_CLOCK);
386 #if _POSIX_MESSAGE_PASSING > -1
387 case _SC_MQ_PRIO_MAX:
388 return (MQ_PRIO_MAX);
390 case _SC_READER_WRITER_LOCKS:
391 return (_POSIX_READER_WRITER_LOCKS);
393 return (_POSIX_REGEXP);
395 return (_POSIX_SHELL);
397 return (_POSIX_SPAWN);
400 return (_POSIX_SPIN_LOCKS);
402 case _SC_SPORADIC_SERVER:
403 #if _POSIX_SPORADIC_SERVER == 0
404 #error "_POSIX_SPORADIC_SERVER"
406 return (_POSIX_SPORADIC_SERVER);
408 case _SC_THREAD_ATTR_STACKADDR:
409 return (_POSIX_THREAD_ATTR_STACKADDR);
410 case _SC_THREAD_ATTR_STACKSIZE:
411 return (_POSIX_THREAD_ATTR_STACKSIZE);
412 case _SC_THREAD_CPUTIME:
413 return (_POSIX_THREAD_CPUTIME);
414 case _SC_THREAD_DESTRUCTOR_ITERATIONS:
415 return (PTHREAD_DESTRUCTOR_ITERATIONS);
416 case _SC_THREAD_KEYS_MAX:
417 return (PTHREAD_KEYS_MAX);
418 case _SC_THREAD_PRIO_INHERIT:
419 return (_POSIX_THREAD_PRIO_INHERIT);
420 case _SC_THREAD_PRIO_PROTECT:
421 return (_POSIX_THREAD_PRIO_PROTECT);
422 case _SC_THREAD_PRIORITY_SCHEDULING:
423 return (_POSIX_THREAD_PRIORITY_SCHEDULING);
424 case _SC_THREAD_PROCESS_SHARED:
425 return (_POSIX_THREAD_PROCESS_SHARED);
426 case _SC_THREAD_SAFE_FUNCTIONS:
427 return (_POSIX_THREAD_SAFE_FUNCTIONS);
428 case _SC_THREAD_STACK_MIN:
429 return (PTHREAD_STACK_MIN);
430 case _SC_THREAD_THREADS_MAX:
431 return (PTHREAD_THREADS_MAX); /* XXX wrong type! */
433 return (_POSIX_TIMEOUTS);
435 return (_POSIX_THREADS);
437 #if _POSIX_TRACE == 0
438 #error "_POSIX_TRACE"
439 /* While you're implementing this, also do the ones below. */
441 return (_POSIX_TRACE);
443 #if _POSIX_TRACE > -1
444 case _SC_TRACE_EVENT_FILTER:
445 return (_POSIX_TRACE_EVENT_FILTER);
446 case _SC_TRACE_INHERIT:
447 return (_POSIX_TRACE_INHERIT);
449 return (_POSIX_TRACE_LOG);
451 case _SC_TTY_NAME_MAX:
454 case _SC_TYPED_MEMORY_OBJECTS:
455 #if _POSIX_TYPED_MEMORY_OBJECTS == 0
456 #error "_POSIX_TYPED_MEMORY_OBJECTS"
458 return (_POSIX_TYPED_MEMORY_OBJECTS);
460 case _SC_V6_ILP32_OFF32:
461 #if _V6_ILP32_OFF32 == 0
462 if (sizeof(int) * CHAR_BIT == 32 &&
463 sizeof(int) == sizeof(long) &&
464 sizeof(long) == sizeof(void *) &&
465 sizeof(void *) == sizeof(off_t))
470 return (_V6_ILP32_OFF32);
472 case _SC_V6_ILP32_OFFBIG:
473 #if _V6_ILP32_OFFBIG == 0
474 if (sizeof(int) * CHAR_BIT == 32 &&
475 sizeof(int) == sizeof(long) &&
476 sizeof(long) == sizeof(void *) &&
477 sizeof(off_t) * CHAR_BIT >= 64)
482 return (_V6_ILP32_OFFBIG);
484 case _SC_V6_LP64_OFF64:
485 #if _V6_LP64_OFF64 == 0
486 if (sizeof(int) * CHAR_BIT == 32 &&
487 sizeof(long) * CHAR_BIT == 64 &&
488 sizeof(long) == sizeof(void *) &&
489 sizeof(void *) == sizeof(off_t))
494 return (_V6_LP64_OFF64);
496 case _SC_V6_LPBIG_OFFBIG:
497 #if _V6_LPBIG_OFFBIG == 0
498 if (sizeof(int) * CHAR_BIT >= 32 &&
499 sizeof(long) * CHAR_BIT >= 64 &&
500 sizeof(void *) * CHAR_BIT >= 64 &&
501 sizeof(off_t) * CHAR_BIT >= 64)
506 return (_V6_LPBIG_OFFBIG);
509 return (ATEXIT_SIZE);
512 mib[1] = KERN_IOV_MAX;
514 case _SC_XOPEN_CRYPT:
515 return (_XOPEN_CRYPT);
516 case _SC_XOPEN_ENH_I18N:
517 return (_XOPEN_ENH_I18N);
518 case _SC_XOPEN_LEGACY:
519 return (_XOPEN_LEGACY);
520 case _SC_XOPEN_REALTIME:
521 #if _XOPEN_REALTIME == 0
523 value = sysconf(_SC_ASYNCHRONOUS_IO) > 0 &&
524 sysconf(_SC_MEMLOCK) > 0 &&
525 sysconf(_SC_MEMLOCK_RANGE) > 0 &&
526 sysconf(_SC_MESSAGE_PASSING) > 0 &&
527 sysconf(_SC_PRIORITY_SCHEDULING) > 0 &&
528 sysconf(_SC_REALTIME_SIGNALS) > 0 &&
529 sysconf(_SC_SEMAPHORES) > 0 &&
530 sysconf(_SC_SHARED_MEMORY_OBJECTS) > 0 &&
531 sysconf(_SC_SYNCHRONIZED_IO) > 0 &&
532 sysconf(_SC_TIMERS) > 0;
539 return (_XOPEN_REALTIME);
541 case _SC_XOPEN_REALTIME_THREADS:
542 #if _XOPEN_REALTIME_THREADS == 0
543 #error "_XOPEN_REALTIME_THREADS"
545 return (_XOPEN_REALTIME_THREADS);
548 len = sizeof(lvalue);
550 if (sysctlbyname("kern.ipc.shmmin", &lvalue, &len, NULL,
557 case _SC_XOPEN_STREAMS:
558 return (_XOPEN_STREAMS);
560 return (_XOPEN_UNIX);
561 #ifdef _XOPEN_VERSION
562 case _SC_XOPEN_VERSION:
563 return (_XOPEN_VERSION);
565 #ifdef _XOPEN_XCU_VERSION
566 case _SC_XOPEN_XCU_VERSION:
567 return (_XOPEN_XCU_VERSION);
569 case _SC_SYMLOOP_MAX:
570 return (MAXSYMLINKS);
571 case _SC_RAW_SOCKETS:
572 return (_POSIX_RAW_SOCKETS);
576 value = socket(PF_INET6, SOCK_DGRAM, 0);
584 return (_POSIX_IPV6);
587 case _SC_NPROCESSORS_CONF:
588 case _SC_NPROCESSORS_ONLN:
593 #ifdef _SC_PHYS_PAGES
595 len = sizeof(lvalue);
596 if (sysctlbyname("hw.availpages", &lvalue, &len, NULL, 0) == -1)
606 if (sysctl(mib, 2, &value, &len, NULL, 0) == -1)
608 return ((long)value);